Elevator-controlling mechanism.



H. A. MOGRORY.

nLEvAToR eoNTRoLLINe mmmmsm.

APPLICATION FILED NOV. 11, 1910. 1,002,294. Patented Sept. 5,1911.

COLUMBIA PLANOUIAFN C0.. WIINIJYUN. D. C.

HENRY A. MGGRORY, 0F DETROIT, MICHIGAN.

ELEVATOR-CONTROLLING MECHANISM.

Specification of Letters Patent.

Application led November 11, 1910.

Patented Sept. 5, 1911. Serial No. 591,781.

To all whom it may concern.'

Be it known that I, HENRY A. MCGRORY, citizen of the United States,residing at Detroit, county of Wayne, State of Michigan, have invented acertain new and useful Improvement in Elevator-Controlling Mechanism,and declare the following to be a full, clear, and exact description ofthe same, such as will enable others skilled in the art to which itpertains to make and use the same, reference being had to theaccompanying drawings, which form a part of this specification.

My invention relates to devices employed in connection with cablecontrolling mechanism for elevators for actuating the starting andstopping mechanism, and its object is to provide means whereby thetendency of an elevator car to creep-when left unattended due to leakingvalves or other causes, may be overcome in order that when the car isleft by the operator there is no possibility of its leaving the iioor.

A further object is to provide against starting the elevator car at anyiioor other than that at which the car is stationed, it being necessaryto first release the braking or controlling mechanism in the car itselfbefore it can be operated.

In the drawings accompanying this specication: Figure 1 is a sideelevation of the device as it would appear connected with the cablecontrol, with parts broken away. Fig. 2 is an elevation at right anglesthereto with a portion of the controlling cable broken away to moreclearly show the parts. Fig. 3 is a detail view of the lower pulley forthe controlling cable adapted to actuate the controlling valve or switch(not shown).

Referring now to the letters of reference placed upon the drawings: A isa standard rising from a suitable base secured to the ioor of theelevator car adjacent to the controller cable.

B is a pinch sheave j ournaled at the top of the standard. Projectingfrom the inner face of the pinch sheave is a brake drum B preferablyintegral therewith.

B2 is a band brake sleeved around the brake drum, the ends of which arerespectively secured to the projecting pins c, c, of the rocking arm Cpivoted at c to the standard.

D is a spring engaging the rocking arm C at one end and the bracket Asecured to the standard at the other.

E is a bar pivoted to the rocking arm C provided at its lower end with atreadle E. Adjacent to the lower end of the bar is a link E2 pivoted tothe standard and to t-he treadle bar.

B3 is a hand operating wheel keyed to the shaft on which the pinchsheave is mounted.

F is a pulley mounted on the shaft of the controller valve or switch(not shown) governing the starting of the elevator. V

f is a weight secured to the pulley to insurev against accidentalmovement of the valve or switch when once operated.

G is a controlling cable leading from the pulley F, at the bottom of theelevator well, up around the pinch sheave B, thence around the pulley H,and thence up around a pulley at the top of the elevator well (notshown) down again to the pulley F in the usual manner.

It will be seen that the pulley H is preferably set at an angle to thepinch sheave in order that the cable will not interfere with the portionencircling the pinch sheave above on its way to the pulley at the top ofthe elevator shaft.

The pulley H is supported in suitable bearings in a slotted way formedin the standard in order that the portion of the cable passing around itand the pinch sheave may be under tension due to the weight of thepulley and cable in order to insure a gripping relation between thepinch sheave and the cable.

Having indicated the several part-s by reference letters, the operationof the device -will be readily understood.

When the operator desires to start the elevator car, he depresses thetreadle E with his foot, which action releases the band brake B2 fromengagement with the drum, then with the foot still on the treadle theoperator turns the hand wheel B3 so as to start the elevator car in thedirection desired. The cable being held against slipping by the pinchsheave, the controlling valve is actuated, thereby starting the elevatorcar. When the car reaches the floor at which it is desired to stop, theoperator actuates the shut-off valve or switch controlling mechanism bya reverse movement of the hand wheel B3, accomplished by merely graspingthe wheel and holding it against rotation while the elevator car ismoving, it being understood that the hand wheel revolves continuallyduring the movement of the elevator car due to the rotation of the pinchsheave,-actuated through traction of the cable G. Upon releasing the vtreadle E, the band brake B2 is applied to the drum B by means of thespring D, whereupon, in the event of the controller valve leaking or theswitch being displaced,-occasioning the creeping of the elevatorcar,-its movement will be promptly arrested by the operation of thecontroller cable actuated by traction with the pinch sheave in turn heldagainst rotation by the brake band upon the drum B. It will thus be seenthat there is no chance of the car creepingl from the floor at which itwas left by the operator,-the cause of many fatal accidents due tostepping into an unprotected well while under the impression that theelevator car was still at the floor at which it had been left.

My invention also provides an effectual locking device to insure againstthe operation of the controlling cable by persons at any floor otherthan that at which the car has been left. By this means in operatingfreight elevators in which it is often the custom not to employ aregular conductor, the. operator is protected while discharging orloading freight against the carelessness of other employees who mayattempt to start the elevator car from another floor.

By providing the pulley F with the weighty, the cable controlledmechanism for governing the starting of the elevator car is given thefull predetermined valve or switch movement necessary to operate themecha- Anism and is insured against accidental displacement.

Having thus described my invention,what I` claim is l. In a device ofthe class described, a controller cable for actuating an elevator carstarting mechanism, a sheave journaled on the elevator car adapted to berotated Athrough traction with the controller cable while the elevatorcar is moving, means for arresting the movement of the sheave wherebythe cable may be operated to control the `movement of the elevator car,and means for releasing said last named element that the elevator may beoperated.

2. In a device of the class described, a controller cable for actuatingan elevator car starting mechanism, a sheave journaled on the elevatorcar adapted to be 'rotated through traction with the controller cablewhen the elevator car is moving, a brake for arresting the movement ofthe sheave and the operation of the cable, and means for releasing thebrake while operating the elevator.

3. In a device of the class described, a controller cable for actuatingan elevator car starting mechanism, a sheave journaled on the elevator lcar adapted to be rotated through traction with the cable when theelevator car is moving, a brake for controlling the movement of thesheave and thereby the operation of the cable, means for releasing thebrake while operating the elevator car, and a hand wheel for actuatingthe sheave whereby the cable is operated to start the elevator afterfirst releasing the brake.

4. In a device of the class described, a controller cable for actuatingan elevator car starting mechanism, the starting mechanism, a pinchsheave journaled on the elevator car adapted to be rotated throughtraction with the cable when the elevator car is moving,a brake drumcarried by the sheave, a band brake adapted to be normally applied tothe drum to stop the operation of the sheave and thereby to actuate thecable whereby the starting mechanism is brought under control, and meansfor releasing the brake band from engagement with the drum.

5. In a device of the class described, a controller cable for actuatingan elevator car starting mechanism, the starting mechanism, a pinchsheave journaled on the elevator car adapted to be rotated throughtraction with the cable when the elevator car is moving, a brake drumcarried by the sheave, a band brake adapted to be normally applied tothe drum to stop the operation of the sheave and thereby to actuate thecable whereby the starting mechanism is brought under control, means forreleasing the brake band from engagement with the drum, and a hand wheelfor operating the sheave-turning therewith when the elevator car ismoving,-whereby the controller cable may be actuated.

6. In a device oi the class described, a controller cable for actuatingan elevator car starting mechanism, the starting mechanism, a pinchsheave journaled in the elevator car to receive the cable, a pulleyjournaled below the sheave around which the cable passes, a brake drumcarried by the sheave, a hand wheel for operating the sheave, a bandbrake adapted to engage the drum, and means for applying and releasingthe brake band.

7 In a device of the class described, a controller cable for actuatingan elevator car starting mechanism, a pinch sheave journaled in theelevator car to receive the cable, a pulley journaled below the sheavearound which the cable passes, a brake drum carried by the sheave, ahand wheel for operating the sheave, a rocking arm, a band brakeencircling the brake drum, its ends engaged with the rocking arm, alever for operating the rocking arm, and a spring engaging the rockingarm to normally apply the brake band.

8. In a device of the class described, a controller cable for actuatingan elevator car starting mechanism, a standard secured to the floor ofthe elevator car, a pinch sheave journaled therein to receive the cable,a

pulley journaled in an adjustable bearing in the standard below thesheave around which the cable passes, a brake drum carried by thesheave, a hand Wheel for operating the sheave, a rocking arm, a bandbrake encircling the brake drum, its ends engaged With the rocking arm,a lever for operating the rocking arm, and a sp-ring engaging therocking arm to normally apply the brake band.

9. In a device of the class described, a controller cable for actuatingan elevator car starting mechanism, the starting mechanism, a Weightedpulley controlling the operation of the starting meohanism,-around Whichthe cable passes,-adapted to hold the cable to the limit of its movementin either direction, a sheave journaled on the elevator car adapted tobe rotated through traction with the controller cable when the elevatorcar is moving, a brake for arresting the movement of the sheave and theoperation of the cable, and means for releasing the brake Whileoperating the elevator car.

In testimony whereof, I sign this specification in the presence of tWoWitnesses.

HENRY A. MCGRORY. Witnesses:

GRACE E. WYNKooP, CHAs. W. GUsTAvUs.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

